Question

Several copies of genes carrying the contrasting characters are mainly included in which of the following laws?

• A. Law of independent assortment
• B. Law of segregation
• C. Multiple allelism
• D. None of the above

Answer 1

The correct option is C Multiple allelism

Alleles are alternative forms of a gene. They are responsible for differences in phenotypic expression of a given trait. When a gene exists in three or more allelic forms it is called multiple allele.

For example, ABO blood group system in humans is controlled by three alleles I${}^A$, I${}^B$, and I${}^O$

IA and IB are codominant and make type A and type B antigens, respectively. IO is the recessive allele and produces no antigen.The blood groups arising from the different possible genotypes is given below.

Genotype Blood Group

I${}^A$ I${}^A$ A

I${}^A$ I${}^O$ A

I${}^B$ I${}^B$ B

I${}^B$ I${}^O$ B

I${}^A$ I${}^B$ AB

I${}^O$ I${}^O$ O

So, the correct answer is 'Multiple allelism'